Description Of Stop B - Siemens SINUMERIK 840D sl Function Manual

Safety Functions Integrated in the System/Drive
6.3 Safe stops A-F
6.3.3

Description of STOP B

Action in the drive and NCK monitoring channel:
The drive is braked at the current limit as the result of a 0 speed setpoint that is
input instantaneously either directly or from the NCK.
Action in the drive monitoring channel:
If the speed setpoint falls below the value entered into p9560: "SI motion, pulse
cancellation shutdown speed", or if the timer p9556: "SI motion, delay time ex-
pired", then the system automatically changes into a STOP A.
Action in the NCK monitoring channel:
Essentially the same as the drive, when the value in MD 36960:
$MA_SAFE_STANDSTILL_VELO_TOL is fallen below or after the timer MD
36956: $MA_SAFE_PULSE_DISABLE_DELAY has expired, then the system auto-
matically changes over to a STOP A.
S Effect:
The drive is braked along the current limit under closed-loop speed control and
brought to a safe standstill.
S Alarm message for an internally initiated STOP B:
The alarm message "STOP B initiated" is displayed.
S Alarm message for an internally initiated STOP B:
An unintentional restart is prevented using a STOP A. The error can only be
acknowledged from the drive and control using a power on.
SGA STOP A/B is active
This signal indicates that STOP A/B is active.
0 signal:
1 signal:
Note
If the timer in data 36956: $MA_SAFE_PULSE_DISABLE_DELAY or p 9556: "SI
motion pulse cancellation, delay time" is set to zero, then for a STOP B, the
system immediately changes over to a STOP A.
6-122
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
STOP A/B is not active.
STOP A/B is active.
© Siemens AG, 2006. All rights reserved
03.06